They are HTTP RESPONSE standard status code. Here are the most common ones:
|200||OK||We received the request|
We received the request and created something. For example, we received a file upload request and a file is created.
|204||No content||Incorrect locale used|
|400||Bad request||Incorrect parameters (input data)|
Authentication error: invalid API key, miscalculated dev hash, etc. More details.
|5xx||Error||Please report a bug to firstname.lastname@example.org|